subbase

Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

n. The lowermost front strip or molding of a baseboard.

from Wiktionary, Creative Commons Attribution/Share-Alike License

n. The lowest projecting part of a baseboard, a pedestal or a similar construct.

n. A certain subcollection of a topological space

Etymologies

sub- +‎ base (Wiktionary)

Examples

To reduce these potential problems it requires a significant amount of subbase, detention, and underdrains to make sure the water is drained as fast as it infiltrates (and it infiltrates really, really quickly).

· In reasonably dry areas, with good drainage and low water tables: subbase of well compacted, clay-rich soil, covered by large sized gravel (to break capillary action), topped by small sized gravel and a layer of sand, the surface layer made of a silty soil, mixed with 5 % linseed oil and compacted with tamper or vibrator.

I have a 'FG' w/top code which is typically the only surface I create inside my corridor, but also created a few other surfaces and added different codes (datum, subbase etc.) to compare volume entries.